drm: Extract drm_mode_object.[hc]

Just for the struct drm_mode_object base class. The header file was
already partially extracted to help untangle the include loops.

v2:
- Also move the generic get/set property ioctls. At first this seemed
  like a bad idea since it requires making drm_mode_crtc_set_obj_prop
  non-static. But eventually that will get split away too (like
  the connector version already is) for both crtc and planes. Hence I
  reconsidered.

- drm_mode_object.[hc] instead of drm_modeset.[hc], which requires
  renaming the drm_modeset.h header I already started building up.
  This is more consistent (matches the name of the main structure),
  and I want to be able to use drm_modeset.[hc] for the basic modeset
  init/cleanup functionality like drm_mode_config_init.

Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160829082757.17913-3-daniel.vetter@ffwll.ch
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index c459867..8ea3e65 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -36,7 +36,7 @@
 #include <uapi/drm/drm_fourcc.h>
 #include <drm/drm_modeset_lock.h>
 #include <drm/drm_rect.h>
-#include <drm/drm_modeset.h>
+#include <drm/drm_mode_object.h>
 #include <drm/drm_framebuffer.h>
 #include <drm/drm_modes.h>
 #include <drm/drm_connector.h>
@@ -2116,16 +2116,6 @@
 	return property->flags & type;
 }
 
-extern int drm_object_property_set_value(struct drm_mode_object *obj,
-					 struct drm_property *property,
-					 uint64_t val);
-extern int drm_object_property_get_value(struct drm_mode_object *obj,
-					 struct drm_property *property,
-					 uint64_t *value);
-
-extern void drm_object_attach_property(struct drm_mode_object *obj,
-				       struct drm_property *property,
-				       uint64_t init_val);
 extern struct drm_property *drm_property_create(struct drm_device *dev, int flags,
 						const char *name, int num_values);
 extern struct drm_property *drm_property_create_enum(struct drm_device *dev, int flags,